Digital Signal Processing Reference
In-Depth Information
• 1990 Dolby digital AC-3 audio
• 1991 First AC-3 audio coded movie show
•
Dec. 1991 "Star Trek VI" coded in AC-3 audio
Today:
• AC-3 audio used as standard in many movies, in ATSC and, in
addition to MPEG audio, in MPEG-2 transport streams all over
the world, and on DVDs.
•
Dolby AC-3 audio transform coding based on Modified Dis-
crete Cosine Transform (MDCT); 5.1 audio channels (left, cen-
ter, right, left surround, right surround, subwoofer), 128 kbit/s
per channel.
MPEG, too, has come up with new audio coding methods:
• MPEG-2 AAC ISO/IEC 13818-7
AAC = Advanced Audio Coding
•
MPEG-4 ISO/IEC 14496-3:
AAC and AAC Plus
Fig. 8.3.
Anatomy of the human ear
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